What should you read in SSR? Whatever you want.
SSR is meant to give you time for RECREATIONAL reading. This means you can choose what you want to read. You can have your own purpose for reading, whether it is to entertained, to be informed, or some combination.
You don’t need to pass a test. You don’t need to write a book report. You don’t need to complete a project– you don’t even need to complete the book if you find that it is not meeting your needs.
Read for fun. Read to escape. Read to learn something you are interested in. Read to connect with different people, different places and different times. Read for your own reasons.